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Process Files

  • Linear Regression
  • File processing (.txt format)

Table of contents

General Information

Regr

$$sum_x = \sum_{i=0}^{length-1}X[i]$$ $$sum_y = \sum_{i=0}^{length-1}Y[i]$$ $$sum_{xy} = \sum_{i=0}^{length-1}X[i]Y[i]$$
$$sum_{x^2} = \sum_{i=0}^{length-1}(X[i])^2$$ $$a = \frac{length \cdot sum_{xy} - sum_x \cdot sum_y}{length \cdot sum_{x^2} - sum_x \cdot sum_x}$$ $$b = \frac{ sum_{y}-a \cdot sum_x }{length}$$
$$err = \sum_{i=0}^{length-1}(Y[i] - (aX[i]+b))^2$$

Calculate the linear regression parameters that minimize the total square err error of the approach

  • Accepts as program parameters a list of files.
  • Each file contains at least 3 lines.
  • The data are numbered from position 0
  • The cases of vertical and horizontal vectors are also taken into account (test files 4h, 5h)

Input format

num1:num2

where num1 => X
          num2 => Y

Sample of a test file

10.7:15.6
5.6:20.5
3.5:15.4
2.4:10.3
1.3:6.2
8.2:10.1
9.1:25

Output format

In the general case, parameters and output are decimal numbers with 2 decimal digits. (if decimal places are needed)

FILE: input1, a=5.31 b=2.32 c=1 err=1340.32
FILE: input2, a=-2.31 b=1.23 c=1 err=13.25
FILE: input3, a=0 b=3 c=1 err=0

where input1 => file name #1 etc





Results

Calculate scores of teams and points. The teams must be ordered based on scores. In tie, ascending order to name. A win gives 3 points, a win gives 3 points, the tie gives 1 point and a loss gives 0 points.

Input format

Team1-Team2: Score1-Score2

Portugal-Greece:1-2
Greece-Spain:2-1

Output format

1.    Portugal  6 3-2
2.    Greece  4 4-4
3.    Spain 4 2-2





How to run

Linux

  1. Open terminal and create a Bash file
$ touch regr.sh
$ touch results.sh
  1. Open your script and add the following commands
#!/bin/bash

  1. Save and close

  2. Set executable permissions

$ chmod u+x regr.sh
$ chmod u+x results.sh
  1. Run executable scripts
$ ./regr.sh
$ ./results.sh

or

$ bash regr.sh
$ bash results.sh

or

$ sh regr.sh
$ sh results.sh
  1. Make sure you include the required parameters for execution to each file
./regr 1h 2h 3h 4h 5h 6h
./results <test file>.txt

Windows

Tested on Pycharm IDE using bash

  1. Install git shell
  2. On PyCharm File->Settings->Tools->Terminal
  3. Change shell on application settings to bash.exe
  4. Execute on terminal
./regr <test file 1> <test file 2> <test file 3>
./results <test>.txt

where <test file 1> => 1h etc
      <test> => test1.txt